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8a-30+2a=5+10-a
We move all terms to the left:
8a-30+2a-(5+10-a)=0
We add all the numbers together, and all the variables
8a+2a-(-1a+15)-30=0
We add all the numbers together, and all the variables
10a-(-1a+15)-30=0
We get rid of parentheses
10a+1a-15-30=0
We add all the numbers together, and all the variables
11a-45=0
We move all terms containing a to the left, all other terms to the right
11a=45
a=45/11
a=4+1/11
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